凯发_Sebastian Volz

Speaker-Sebastian Volz

Sebastian Volz
CNRS, France

Present and past positions
2010-: CNRS Senior Research Fellow at Ecole Centrale Paris – Laboratoire EM2C
2008-2010: CNRS Senior Research Fellow at the University of Tokyo.
Laboratory of Integrated Micro Mechatronic Systems - CNRS-IIS
2002-2007: CNRS Research Fellow at Ecole Centrale Paris
Laboratoire d’Energétique Moléculaire et Macroscopique, Combustion (EM2C)- CNRS
1998-2002: Associate Professor at the National Engineering School of Mechanics and Aerotechnics
(ENSMA). Laboratoire d’Etudes Thermiques.
1997-1998: Post-doctoral stay at University of California Los Angeles. Pr. Gang Chen (now at MIT).
Cursus
2004: Professor thesis (HDR) at Poitiers University.
1996: PhD degree of Poitiers University.
1993: Master degree in Heat Transfer, Poitiers University.
1993: Engineering degree from the ENSMA “Grande Ecole”.
Responsabilities
Head of the CNRS European Network “Thermal Nanosciences and Nanoengineering”, 2001-2018.
Head of the division “Transfer Physics” in the EM2C Laboratoire 2012-.
Head of the team “Thermal Nanosciences” in the EM2C Laboratoire 2010-.
Head of the Thales R&T/Ecole Centrale Paris Research Team, 2009-2017.
French delegate to the International Heat Transfer Community (AIHTC).
Head of the Microscale Heat Transfer Track in the French Thermal Society.
Associate editor of the International Journal of Thermal Sciences
Member of the International/Advisory Board for "Journal of Nanoelectronics and Optoelectronics'
Editor of three books:
Thermal Nanosystems and Nanomaterials, Topics in Applied Physics, 118, Springer (2010).
Microscale and Nanoscale Heat Transfer, Topics in Applied Physics, 107, Springer (2007).
Micro et NanoThermique, Editions du CNRS, Sciences et Techniques de l’Ingenieur (2007).
Reviewer in more than 20 journals: Nature Materials, Nature Nanotechnology, PRL, IJHMT, JHT…
Organization of scientific events
Chairman of THERMINIC 2015
Chairman of the e-MRS Symposium Phonons and fluctuations, Spring Meeting 2014, Lille, France.
Chairman of the Phonons and Fluctuations International Workshops (2010, 2011, 2012, 2013).
Chairman of the International Workshop Phonon Engineering, Barcelona April 2010.
Chairman of the Spring School Thermal Nanosystems and Nanomaterials, May 2008.
Chairman of the MRS Symposium Nanoscale Heat Transport –Spring Meeting 2007, San Francisco.
Chairman of the International Workshop Nanoscale Energy Conversion, Nice 23-26 Sep 2006.
Chairman of the Winter School Micro and Nanoscale Heat Transfer, March 2004.
Scientific committees: IHTC, ASME, IFHT, HEFAT, THERMINIC, SFT Conferences, PHONONICS....
Award
Bronze Medal of the CNRS 2004.
Publications in Figures
338 communications including 11 chapters, 119 articles in peer reviewed journals, 43 invited conferences, 67 proceeding articles with peer review, 98 communications without papers.Citations: 3290 Google, 2150 ISI. h factor: 30 Google, 26 ISI.

Title：Graphene as heat spreader for thermal management of opto and electronic devices

SymposiumB15 Graphene for High Power Device Applications

Starting Time

Ending Time

Abstract

Graphene and few-layer graphene have attracted tremendous attention for heat removal thanks to their extraordinarily high in-plane thermal conductivity. Understanding the thermal energy transport in graphitic nanomaterials is important to the engineering of graphene electronics with better engineered heat transfer properties.

In a first stage, I will present how the cross-plane thermal properties of graphene and few layer graphene (FLG) strongly depend on the number of layers and the environment. The physical mechanisms at play in the thermal resistances between FLG and substrate or inside the FLG and their canonical values will be detailed. Chemical functionalization of graphene has been proved to improve interfacial heat transport by introducing additional thermal pathways through the functionalizing molecules. Nevertheless, functionalization-introduced point defects destroy the intrinsically high in-plane thermal conductivity of graphene by strongly scattering phonons.

Our theoretical calculations and experimental results demonstrate a counter-intuitive enhancement of the thermal conductivity of a graphene-based covalently bonded to functionalized graphene oxide through silane molecules. This increase in the in-plane thermal conductivity of supported graphene is accompanied by an improvement on the graphene-substrate's thermal contact. We hence achieve an unprecedented level of tuning of the in-plane thermal conductivity of the supported graphene.